package com.qk.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.qk.commen.PageResult;
import com.qk.dto.CourseDto;
import com.qk.entity.Course;
import com.qk.mapper.CourseMapper;
import com.qk.service.CourseService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class CourseServiceImpl implements CourseService {
    @Autowired
    private CourseMapper courseMapper;


    @Override
    public PageResult<Course> list(CourseDto courseDto) {
        // 分页
        PageHelper.startPage(courseDto.getPage(),courseDto.getPageSize());
        // 调用mapper
        List<Course> courses = courseMapper.list(courseDto);
        //强转解析
        Page<Course> page = (Page<Course>) courses;
        return new PageResult<>(page.getTotal(),page.getResult());
    }

    @Override
    public void delete(Integer id) {
        courseMapper.delete(id);

    }

    @Override
    public void add(Course course) {

        course.setCreateTime(LocalDateTime.now());
        course.setUpdateTime(LocalDateTime.now());
        courseMapper.insert(course);

    }

    @Override
    public Course getCourseById(Integer id) {

        return courseMapper.getById(id);
    }

    @Override
    public void update(Course course) {
        course.setUpdateTime(LocalDateTime.now());
        courseMapper.update(course);

    }

    @Override
    public List<Course> listAll() {
        return courseMapper.listAll();
    }


    @Override
    public List<Course> listBySubject(Integer subject) {
        return courseMapper.listBySubject(subject);
    }


}
